OpenAI's advertising business has reached one billion dollars in annualised revenue, per The Information, while the company simultaneously redesigned its ad campaign onboarding flow inside ChatGPT to reduce the barrier for marketers entering the platform. The company is also trialling outcome-based pricing — a model in which advertisers pay only when the AI system produces a defined outcome rather than for impressions or clicks. The combination of scale ($1B ARR), simplification (redesigned onboarding), and structural innovation (outcome-based contracts) establishes ChatGPT as a mature advertising platform by the metrics the industry uses to assess such things, not just a novel placement opportunity. The outcome-based model is the most significant structural development: it aligns OpenAI's incentive with advertiser performance rather than platform usage, which is how enterprise software has increasingly been sold since the SaaS model matured. For marketing teams still treating ChatGPT advertising as experimental, the $1B ARR milestone indicates that the experimental window has closed. Competitors are on the platform. The early-mover advantage is narrowing.